Unable to invoice intercompany sales order in ax 2012

Hi All,

We have intercompany sales orders in 1 legal enity(HKM) which are not getting Invoiced. Apart from this, other Sales order which are in other legal enities are getting invoiced.

What is the reason and how can i invoice intercompany sales order. 

whenever i click on Invoice button of intercompany salesorder , The lines show empty as shown below .